Server Timing Attack
AdvancedWhen servers compare strings with ===, response time leaks how many characters match. Exploit this timing side-channel to guess the password, then fix it with constant-time comparison.
Progress:
1
Exploit the Timing Leak2
Apply the Fixauth-server.js (VULNERABLE)
// Vulnerable: early return on mismatch
function checkPassword(input, stored) {
return input === stored; // leaks timing!
}
Quick probe — try first character:
Response times (timing leak)
Submit a guess to see timing data